238 ME. W. PEECT SLABEN ON THE 



of junetiori, internal peak rounded and very little produced. 

 Eaeli moutli-plate carries two secondary superficial spines — one 

 short, dumpy, obtuse, compressed, standing on the surface of the 

 plate at about one third the distance from the adoral extremity, 

 and directed somewhat outwards and away from the mouth ; the 

 other, rather longer but much less robust, placed quite at the 

 adoral extremity and rather geniculated sideways ; in fact this 

 spinelet might almost be ranked as a mouth-spine proper, except 

 that it stands at a slightly lower level, more on the plate itself. 

 On the horizontal margin of the plate, and situated on the widely 

 expanded lateral flange, are 4 to 5 small compressed mouth- 

 spines, very much smaller than those just described, and similar 

 to the ambulacral spines, only smaller in size. 



The actino-lateral spines, although long, do not meet in the 

 interradium ; indeed the dorsal and ventral membranes coalesce, 

 apparently normally, in the outer portion of the median inter- 

 radial line, thereby forming a partition in the interbrachial cham- 

 ber. The spines which come near the interbrachial margin are 

 much thickened and knobbed at their extremity ; indeed all of 

 them are more or less so except the most outward of all. There 

 are about 32 to 36 actino-lateral spines, the 15th to 17th from 

 the mouth being longest ; beyond this they diminish very rapidly 

 in size. 



Colour, in alcohol, white. 



Station I. Lat. 41° 57' N. , long. 9° 42' W. Depth 1125 fms. ; 

 Glohigei'ina-ooze. 



Htmenastee coccinatus, n. sp. 



Marginal contour stellato-pentagonoid, interradial angle well 

 rounded; radii tapering to a fine point, with lateral margins 

 almost straight. Minor radial proportion 55"5 per cent. ; i2=l8 

 millim., r = 10 millim. Form very depressed, slightly convex and 

 rising in the centre. No definite marginal fringe. 



Supradorsal membrane very fine ; muscular fibres thin, filiform 

 and well defined, forming a rather wide and irregular reticulation, 

 resembling to a. large degree the venation of certain leaves more 

 than the characteristic intercrossing of fibres radiating from 

 neighbouring spinelets which is generally noticeable throughout 

 the genus. This peculiarity arises from the frequent bifurcations, 

 bendings, and sudden terminations to which the fibres are sub- 

 ject, and which, together with the presence of small secondary 



